Users in separate departments are able to see and edit different fields on Opportunities. The Sales team can edit all fields on the Opportunity while the Support team has read-only access to these…

Sharing Rules control record-level access, determining which records a user can see, not which fields on a record they can access or edit.

Role primarily controls record access through the role hierarchy and does not directly govern field-level security.

Profile settings directly control field-level security (FLS), allowing an administrator to specify read-only or editable access for individual fields on an object for users assigned to that profile. This is the primary mechanism for differentiating field access between teams like Sales and Support.

Public Groups are used for grouping users for sharing rules or other mass assignments, but do not directly control field-level security.